Resilient bolt.



(E. moons. RESILIENT BOLT. APPLICATION FILED IULY 3 1913.

1,228,189. Paten@ 1II.eIy 29,1917.

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Nr En STATES PATENT cierren.

ETHAN I. DODDS, OF CENTRAL VALLEY, NEW YORK, ASSIGNOR TO KERNER MANUFAC-4 TUBING COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENN- SYLVANIA.

RESILIENT BOLT.

Specicaton of Letters Patent.

Patented-May 29,1917.

Appncation mea 1111573, 1913. serial No. 777.211.

new and useful Improvement in Resilient Bolts, of which the following is a full, clear, and exact description, reference belng had to the accompanying drawings, in which- U Figure 1 is a side elevation ofmy 1mproved bolt.

Fig. 2 is a sectional view on the line II-II of Fig. 1. Y

Fig. 3 is a side elevation of a bolt and nut placed in position for holding several members together.

My invention relates to the class of 'bolts wherein longitudinal elasticity or resiliency is desired. It is principally used in railway track structures, but may be used in other locations where elasticity is desired.

The precise nature of my invention w1l1 be best understood by reference to the accompanying drawings which will now be described, it being premised, however, that various changes may be made in the preclse form of the bolt, the method of making the bolt and the twist in the bolt, without departing from the spirit and scope of my invention as defined in the appended claims.

In carrying out my invention in its pre'- ferred form, I take a bar of steel of semicircular cross section, preferably rolled, and bend the bar upon itself at its central portion to form an eye, such as indicated at 2 in Fig. 1. The flat surfaces of the two members of the bar are broughttogether so as to engage each other throughout the length of the bolt from the eye, and the bolt is then. twistedl and threaded at its outer lend, as lndlcated at 3. A'vbolt such as shown in Fig. 1 but which has been twisted to a greater degree is shown in Fig. 3. AfterV the bolt has been secured to its position, any lateral strain on the members 9, 9 will 45 tend to compress the members forming the head toward each otherV and permit a slight spreading of the members 9, 9, such asis caused on the fish Yplates of a rail joint, and as soon as thepressure hasbeen removed,the bolt will assume its original position. The twistingv of the bolt at an angle will also permit the body of the bolt to be extended under such stresses.

The advantages of my invention result from the provision of a bolt having a portion or portions which are adapted to yield to permit elongation of the bolt. Further, Y -r from the provision of a bolt having a plurality of members twisted Vabout each other at an angle of less than 180 degrees to permit a further elongation of the bolt.

I claim:

1. A bolt having a head in the form of an eye, and separate members extending from the head to the other endV of the bolt and having screw threads on the ends thereof, said members being twisted about each other at an angle Vof less thanV 180; substantially as described. j Y 7 2. A bolt' having a head in the form of an eye and a plurality of separate members extending therefrom,the ends of said members being provided with a screw thread, said members being twisted about each other;

ysubstantially as described.

In .testimony whereof, have hereunto set myhand. Y

y ETHAN I. DODDS. Witnesses:

GEO. B. BLEMING,

Lno A. GUEHL.

Copies of this patent may be obtane'dffor i've cents each, by addressing the Commissioner of Patents, Washington, D. C. 

